Abstract

In this paper we present experimental and theoretical investigations of effects of biexci- tons on coupled exciton-photon excitations, or cavity polaritons, in a GaAs quantum well (QW) microcavity. Using polarization-dependent transient pump-probe spectroscopy, we show that biexcitonic effects can result in a significant increase in normal mode splitting (NMS) of cavity polaritons, in sharp contrast to effects of band filling and exciton ionization that reduce the NMS. A theoretical model based on modified optical Bloch equations is developed to describe qualitatively effects of biexcitons in semiconductor microcavities.

© 1998 Optical Society of America